Objective 2.4
N10-009Explain important factors of physical installations.
Objective 2.4 sits in Network Implementation, which carries 20% of the Network+ exam. The questions below are original, written from the official objective title above, and each explanation cites the CompTIA page it rests on.
Objective title verbatim from the official objectives. CompTIA exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
Mounting bracket holes on a rack-mount switch are spaced at one rack unit. How far apart is that?
Correct.
Checked against juniper.net, August 2026Concept
Rack space is sold and planned in a fixed vertical increment, and every mounting bracket is drilled to that increment. Height and width are separate figures, so a device that fits the width may still need several increments of height.
Why D
One rack unit is 1.75 inches, or 4.45 cm, and brackets drilled to that spacing fit any rack whose holes match. Counting units is how a closet's remaining capacity gets planned.
Source
Juniper Networks: EX4400 Site Guidelines and Requirements, checked August 2026The holes in the mounting brackets are spaced at 1U (1.75 in. or 4.45 cm) so that the device can be mounted in any rack that provides holes spaced at that distance.
Now you: objective 2.4 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A wiring closet logs a steady 35 degrees Celsius and 93 percent relative humidity. Which reading falls outside the published operating envelope for the switches in it?
Sample question 2 of 3
A technician fills a sealed cabinet with switches, leaving no top vent and no perforations in the doors. Temperature alarms start firing on the upper units. What is the mechanism?
Sample question 3 of 3
A powered switch is configured as shown and its total power budget is then exceeded. Which port loses power first?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.